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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1d6a8b530711feff7eef29c8da5dcb8f714c0036be0a741b36d4e75e3ed425' 
  AND token = 'lgNHZJZQbean0N244+97Z2jD2E5oDdrIsdiKnFDuWYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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