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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792651ecf2a864ab48b6cf58ac2c413de82faee656b64820709212d315d5fced' 
  AND token = 'aV4CnXFmvMueB/WKnCD2xDAX1fQf+vY6bKBM2oOVlR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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