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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b08cba3d6ee28b2a0a144bc5cc81da3854e804ea12f746b41e5ac2fa67d44c5' 
  AND token = 'D1ftSXGv7ApWGbzu7l8oAj4Lz0o/UjniPfW+vMGAwNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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