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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df1e6f69f7a11ee50e78dbb0b844cbac006c2cd3e3e0b1fc59f34ffc1d61f02' 
  AND token = 'vVl1jDiMWHcKyI2D1ElIVGdItcxFrZNYfmDEddNmygg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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