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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f15cb659be101578d7a3c68e7c62859bec409637c52b735fe64fab52d2d82f' 
  AND token = 'o543i0DUu4+JdFqokmdadg0kvwckCMFx2boMap8f7X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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