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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077b8fb3fab6ef1c55bdb10f834174518d6e68665e1a5a5fa833efd2502f6603' 
  AND token = 'u1Ttj/AaO/5az8DH3dG8WJBOl5vu9UK4stEQltnWjkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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