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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918e0553cf14565f31dbec6c662c650fd3167b95ee173111c637e8836f0f9e1e' 
  AND token = 'Lzr8pDsT/MCLNCS7RzpwPpCwvjqPXXC1wIipnfwH8Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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