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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afb400f1511f27826a70f8cad084606a0932e70ed5864d1fd648ac0e5c2420e' 
  AND token = 'qVVD2GmgyKTkTfXvaZtgL88tGOiFns8BxnirgHP0Hbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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