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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1afc12b9ea45fbb25e8f102d3257778aa53a66d9e781e51519b03828d57f83' 
  AND token = 'ljwEKRU+uWcF80pYcc7EG0u1GlVzSYdr0bTfbdYth+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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