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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0196f45570224747892dc81873016058e5648d0ab700fb59c5574834cb9704b2' 
  AND token = 'OCdBcli1P5qw+6PpnIHZxZvEEpv+6BSPoMkGHfk2U1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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