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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e6a9bf71034c4e73ee896230f01fe3193f7d2ef6a6a45e34034fa4f226db15' 
  AND token = '2J6jFugrfxElpxrt5Ixu6B8tZYE088+CJNzBOcfJvKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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