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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0136ea23a071125e64dd859d692a52227356db0fad2731a754b2ccccebef1179' 
  AND token = '0puOY7Zlj5gBNwez5xjoJyWeOxnhlrvIADGn5u3WJjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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