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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ea9a109ca5f562dc39db1cbe6d3d416e45ec29fa30890819a37b61059fff5f' 
  AND token = 'KeS+qLvriJ7bA+yIoSvvh0dj7+OPmskqiHd1EXudXiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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