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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e41d076b32a0a71ae959d57a718538588efe69b50fe26a5642ea28ad99ad4ab5' 
  AND token = 'qLKtX8wAQihplVQPXNScCWFDaN2yTyrWiL6JagG0HqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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