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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11599e54e112222ed68710392f8fd456b3f4650efacd20ab83f6e8a45ee1e898' 
  AND token = 'SPmmKHa0T466cV/HApu8U9kDWVho6vuTuPhrIxye5Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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