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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d17e8a9b463a33f06f2df96429bf890da189934ed748a4ef6729cf418ef5a8' 
  AND token = 'W93lirAVh1H3HTXBbGr8oXB7LqUwgeDPDd2/NM85JMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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