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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9776219f9f239e1c52e89618214ab73b68272956d701481b5fa7699ebfa66d02' 
  AND token = 'GZ+tOL5vCb87RP5zpLjbcfVG3SO5aI+khCvfNh9IuUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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