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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a19bad739b1b621ca1bf77f6d1ccc592939bfbd122804d3c2e972ce5dce1c13' 
  AND token = 'nb1Ze4d9e01hUxm/sC1jLM9mw/tPumeDIslm6hsnLPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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