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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa217b9588c384af37cb084a5270272ae4b09dcc50c6b1f4a0d3af0c327bec2d' 
  AND token = 'fPFm/K953nN+eHhP6ZmPff/HFg8I0BucFyw9bc1iyfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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