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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3612743cd53338cd00c22ce7594282883365d000a25de6a042784691b53c431f' 
  AND token = 'p7UIRqdyEEo7PzpOdMndMtqM17R6TRV8TOzQnVidc3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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