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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808050fd05c524aec638285166fd495852f3a8dcb4116a8304649bf4e6f9e4b3' 
  AND token = 'LYsf+iE95JlZdcajq5PjfMHMUlOT/iEyiZEjO1ug4wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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