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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5fd1c1d42dd42ed1d2b756500fed2df53a9d11f09e9b15f1aa8be3696c6ae0' 
  AND token = 'gou8DEH+xsm9k1HvORuqnxlLnM4GOkUuu9aJeVeCNhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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