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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19840cc98eb8bf101b393c4153aca4fb95809b42dbca3e943000b148833bf7e6' 
  AND token = 'Kg+/s+JWkGhR1kADdenK5eEz+RKaEBvAQbObekDg9b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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