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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6c92512c59e65a875a514054841a7a3e0c37de4877e8e2d30b24735dd2be94' 
  AND token = 'eeJsWs0649KqcRShoAEYrtmn7kcFCV15fMLHrlbrIjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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