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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c313dd0c2642df8048632c14b7ba0a41050ce8eecf0dde62b53c8fefaf644fc2' 
  AND token = 'aqNBwzWrw/+LNUVRxDTmztK1m5YEYjynGRBsku6rfnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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