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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7568094eb978024c0b8b4b1e798dfca3bf60cae18f858af1a8c6cac5328424b6' 
  AND token = '/M6sTsH8VpWTI4jpzLzGqDLklvupPamKf5L+JaP9ocI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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