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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04aa8ba3f28955d665432f3ff4742118afe3e341f154c87e83e16e32520736a4' 
  AND token = 'na7ZgBJtkvXV6P1HrYS6ozSHZd2LI5FgvdrucrdRC+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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