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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46971b3526adb1b4e761afb486dbe9316bbf14e74197fe794f33fdc0b0bf6ae6' 
  AND token = '4/+3TtQc/LccwYdl3JS0Rx0C2Y5pwTXB0QTPa1QPins=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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