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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a885bda6f59178f9a01622ea86cba85d47b44def481c5d27b781d3fc0e6cdb6' 
  AND token = '25MDRg8CF0/zLUtNOdfMS4U3/eVgmijSpY8vEF05Cp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}