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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94aa245d1eb7c4e36fe06e6c584f2a2fb372ee72cfc01e668b55d6f111cc17b7' 
  AND token = '4oHoLwQ2VZ6hwCqXLBs+iKl1cIPNkSpuLa0UpBGCOF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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