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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f326229bc44683bd3a88e96b206492e2db9557f14fc04465795cc56f4338df6' 
  AND token = '3emXlg8QelRYW6ZZCpuDN59j4Pa6AYWu9dwEwEHWSRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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