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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94149b13e0fdd6af82e3a1b41eddf5bd4ef8760840ef300acac846a90e1ba85' 
  AND token = '/ugs6d7K2m23DflgKzubImd/Z9GJs9Zu4e1IfBGPx4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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