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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69cc6f8032a40eae5836af03bf0b149128dbf61be12bc51b0a1bd1d6488a4089' 
  AND token = '3zyECSrFgeH2AvvrbzGHeo+688YNDWBCxh1uJ/jUaO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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