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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7cb77373de542079f0e7960b5e0883dbe9e27ac3e4c7238391e70452e04152' 
  AND token = '/PjOG/yK0U5QTB1uPnesnT5T+WSb8zPuNuEs1TRXT78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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