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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6d70f2a634d1ed6c1031290370512db7354ea9e0e720a835804282eb4e33d5' 
  AND token = 'g42JUXWYp5Heq5sMOKZocBgAy57fzgeoGEhT9/G0C4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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