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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ac470e9accb88ba10d2c341ef751a1f396111ae596043ebf2d474f227e4738' 
  AND token = '4KM0DTEsx+q7a2kvfCKdGTe4ToENx79AyXApxPa5cLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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