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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d873895874ca5ec837f2320f540735b37798f4b7722a4befcbbee8987fe142' 
  AND token = 'mEtCDvUm4J34o3RTmU4krKVNsnrd4WVLK7pFIpH0Ca8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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