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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92767957945e804e35ed9eeadcc32e2a68e9eeddfb0ce44c4e45803af5bc5a5f' 
  AND token = 'qedlDsCYIcMAdI9udGhTOLyGSWt5OTX7g8JYSS9yr5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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