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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b5bf4c6721da153eecb312f20d8d148e493956c0538aaa492b4510f4e9e9ea' 
  AND token = 'Y9OzqkkT6xfhXSpllbFLKjhaYSk4K4wAATX+0QHwNzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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