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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58c6cdb170badb40dc2e7ca0611697548def002ff2f0718e75c5ff57c64c5fc' 
  AND token = 'vRvqoAHNL2g084LuZX+ghQkRxjaaFZxEvqg24C6DvHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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