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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708c1960a6f23f64a36c50e1fdbf66c9efd620d5ca5a2400df006e6b76a8575f' 
  AND token = 'rrfZBE93gh9PcGE9wgH3X5ejZuoyLyOwKhnEJssz0Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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