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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd271eba5b7cb538af475955e6e4a2a8c434cc4cd5d109567359016c8de116327' 
  AND token = 'P/Pj4Mo4f85mLIZ2GBH61rv9iCnDCLNxSECk62a1cmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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