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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37dc8672ebce85961389d6d6660307f250afe7cdb76420d1e1e642c6fffb24ca' 
  AND token = 'RCDqcp8AVJVxq75V2LH9RpvENjg/mJoGcUzaA01gS9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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