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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d6f2b41ffdf54dedd93b48ee601158530921628dee9494c6df4be9aaebff74' 
  AND token = 'PdkdhYHiiQNgW6BWBbw8oWcnXOyUE/owppCxlLRdt2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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