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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0e5438428f7d6dcae265e1814f0d3b73241be514d26691a0635bab7ec824f4' 
  AND token = 'FDgK2yGeMUxu0bon1uMz4fiRwk4ulgrj8i8HE1C8J/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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