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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870693937afa901f7b4294f0a8c3ffcdeb52be748fb4e0cc9694ba091f6bd612' 
  AND token = '5k1j29/6ro7BSFFCgYhfu6P8k+7uluq44LVVD8VMyB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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