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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791ead43b8cfdfd204fbbe6ca8df282ff94863c525c8b3463217635a5875ac2a' 
  AND token = '4EGvNPKPH3QTNyxNg2yNKC4v9/0hL0gHlqU20KEzKz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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