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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0426f0fc81cfeca47ff823148e1d2fb6f4b2a3e217d45ec4c462f3b40561c3fc' 
  AND token = '4AAZyXGgcHTSnmbXu61051WW32Ds8va7hwNzfZoYJAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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