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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e292ef813765f7abb80873ae03931c069a2b7f8727eafd4f472510bea5d0d812' 
  AND token = 'YtiUS120rQtd2Pq94RSwrDHIVL99La5QXNH7e6nFJuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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