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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f19fb6642c7667361a80870ad0305bbf78bfcbaef35bae9772cc92ebff9a8c' 
  AND token = 'kEaC88E3YHg1+BnW/MRloEHye5S6oBUyBb4MpUn1IYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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