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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c2a625d16f80772c8a9c9c7b0ec470337b92f117ce8e4a2c779ca56c8e9298' 
  AND token = 'eJ6gPVG/0QoqPXuatepGVLT6VF16GxlkDL0W6NdVdXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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