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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2231b4e620e0448db3c51faa4c480d1d5102bfd3ce8f0cb4636a82ec0b28cd' 
  AND token = '1LdsS5nFmiro40fo/0ryV85Oyn3Ng4coJGzmewmFccQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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