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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825904b13758d3e923aa8ae34cc34bebb715399d3fe8ec877914c62b66ac2690' 
  AND token = 'Js8RVmcsm6SmJBdB6UilyrsJm8BiPY0Ls0LyiFBgpY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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