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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a64f35254115d07dec783cefd7bc3ffde4b206edc89a966f4ba7ac4c76b690' 
  AND token = '2LSQ1iYU9B3MaCdU/vEMvRz93EGAyOcEkbVnoJ6Ljxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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