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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ea12655f5bb1beea14cf49d9f7221ba80109b06b53e788f227d2486b7ba807' 
  AND token = 'hUTzvPYhOrpo5nu3pKIr336RlkKJykbp8uWUJ3TOdqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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