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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c235c990111ba3df5f292cdd420c428d86575ba484139f948fdfe8d19e888bca' 
  AND token = '5m5XDlyo6OO+O0gNTGQEsR6LLep3Iw/ama2O8walOIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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