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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e629426dbcb0337f45402a3cf69e9f80725f9750e7a6614f5bf841c42b4531' 
  AND token = 'YVkBc7tD3zu20Le5OrxUjJYhQ3dSS1+6pcj2vlZ0drs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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