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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb6ece1f7663a6807b57500b97f5bb8a9e61d873ba278bacc6a60e3d4161add' 
  AND token = '3PsSzf8bLGVfuc9vezeUUfodsrq22SAb/OQFW+3bItQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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