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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b0392df90bd39b2b57ae980d342c8014371e2fe3824a22ec9e518d341ca9b7' 
  AND token = 'oZtNDhWBwPJSbuxzAdZ36RhUThJMpk0kUhG06x9qYfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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