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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf784c95494a46b172722828a381dc5b3a8c3c9437adf0da7f8b20b90dfe1fe' 
  AND token = 'p8G/r9vr1zZipC93eWvCGbakf82K0w3c20mnm3ztI2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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