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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998043739f03da7dbc672a8b76c189a5b885d88edce33126b156705663c43dcb' 
  AND token = 'xrAN5cspyBume3tPi4DoXgSVB/fgIT0FxcYERK3ne8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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