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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dca2e0eaf4efe936473cc0c57aaa37f6fb97e5f44eb775cf703824fd3343e3' 
  AND token = '/2XGyo8XLq7xs8WF+TpOgduc11b2LG+khJ7KHqniCSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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