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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11837fe4d5d697336552e31f3b3ac097db8b052d67b4e70db4c2f026370d254' 
  AND token = 'YwJYuoLHVHRitFXFG96N2WT7xmUp6uJLtg6mp3qXM4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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