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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8087a72c6e5bed664937be5b6dc1e839a64a5a2b52f61e9631e4b9f5ab5bb1' 
  AND token = 'z/gzOuT6cJ6oWGlxVCHWZkASsd0TMZxvlWCsX2I6bA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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