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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b646e9497ab4351f48b0922115a293fa36b96f6ce1b80a6a0cdb880d2f774f8a' 
  AND token = '2aQavraodne7quSdMBPcUkhGPAZRm/q8ceo5NG6plHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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