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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f996cd32bad254aae10d73f3e2682a9669c354ebb3367a14584546947da03dc4' 
  AND token = '/mDYzzrYnpMYk1Pn7dJDBUC/7YZ//Usq+dDtWyx1kNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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