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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32950aff74ee5f6abc89a780877a7522bd8beb9b10a9762c6dedad0c2af250e1' 
  AND token = 'QxUwEpFTvnuoW8EGg8h3e6EjGrV/cuEh7Qa5+UnSy8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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