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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275c6871781308f3533b2674e4573444b1df881fa153a406da27713175db8faa' 
  AND token = '66TkvnUZTMro7t7qCnI8BAxmWPqMNQO5P4TRYAqX9f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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